Ricoh IS450 Scanning Composition, Binary scanning, Halftone scanning, Gray Scale scanning

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Functions

Scan

This function scans an original once the scanning area, scanning composition, resolution, and other values have been set.

When setting these values, consideration should be given to the original that is to be scanned and to the output device (display, printer, etc.). For example, it is meaningless to scan an original at high resolution if the resolution of the output device is lower than the scanning resolution, especially because high-resolution scanning uses a great deal of memory and requires more processing time.

Scanning Composition

There are three scanning composition modes: binary scanning, halftone scanning, and multi- value scanning.

❖Binary scanning

This mode scans the original in black and white. This mode is used to scan originals that consist only of text, line drawings, and other elements that lack intermediate colors.

❖Halftone scanning

This mode scans the original in pseudo-halftones created by dots. This mode is used to output an original that contains intermediate colors, such as a photo, on an output device that can only express binary per pixel, such as a laser printer.

❖Gray Scale scanning

This mode scans the original with 16 or 256 gradations. This mode is used to output an original that contains intermediate colors on an output device that can express different gradations for a single pixel, such as a Dye Sublimation printer or a display.

Original

Binary

Halftone	Gray Scale	45
		45

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Contents Image Scanner Introduction Copyright Declaration of Conformity Examples of Indications Safety InformationSafety During Operation Safety Information Iii Important Information Important InformationImportant Information Reference How to Read This ManualHow to Read This Manual LimitationTable of Contents General Scanning Method Manual Scanning Setting OriginalsOriginals Options MaintenanceSpecifications DIP Switches FunctionsPage Introduction FeaturesIntroduction Space-saving designGuide to the Scanner DIP Switches Power ConnectorRotary Switch Scsi ConnectorDescription Understanding the IndicatorsIntroduction Checking the Scanner Location Preparing for InstallationSetup location Installation environment Important Setting up the Scanner Installation spaceUsable range Recommended range Scsi Connection Require Ments for the Scanner Connecting to the Host ComputerWhat is SCSI? Setting up the ScannerConnecting to the Host Computer Setting the Scsi IDConnecting the Scsi Cable No Connection to Other Port Connecting the Scsi Cable Connection to Other Port Connecting the Power Cable Plug the other end of the power cable into the power outlet Turning Off the Scanner Power Turning On/Off the Scanner PowerTurning On the Scanner Power Initializing the Scanner Originals Recommended Sizes and Weights of OriginalsDifficult to Detect Sizes Contact glass Auto Document Feeder ADF Original Sizes and Scanning AreaOriginals Original sizes that can be detected automatically Setting the Original on the Contact Glass Setting OriginalsAlign the originals on the ADF Setting the Original in the Auto Document Feeder ADFSimplex scanning Duplex scanning Guides Make sure the Auto Document Feeder ADF is closed Setting Originals General Scanning Method Scanning OriginalsScanning Originals Manual ScanningItem to check Action When Scanning Does not StartDescription of error Action Error Indicators and SolutionsTroubleshooting When an Original is Jammed in the Auto Document Feeder ADF Procedures to Correct Errors in the ADFReplacing the Ink Ribbon Do not pull on the Endorser’s cord Cleaning the Endorser Cleaning the Scanner MaintenanceAppendices Cleaning the Feed Roller and DrumMaintenance Cleaning the White Roller Duplex Model Only Maintenance Moving the Scanner Carrying the Scanner a Short Distance Disposing of the ScannerRed Lamp Unit Type a OptionsImage Processing Unit Type a Endorser Unit Type a Printing Function Scanner Electrical and Hardware Specifications SpecificationsDIP Switches Preview FunctionsHalftone scanning ScanScanning Composition Binary scanningBinary Scanning/Threshold Standard modeDynamic threshold mode Halftone Scanning Gray Scale Scanning Area Extraction Section Area Multi-area Settings Auto Photo/Letter Resolution Contrast BrightnessGamma Correction Smoothing Binary FiltersParameter Download Noise removalDocument Size Detection in the Auto Document Feeder ADF Document Size DetectionDocument Size Detection on the Contact Glass Erase Background When Erase Background is disabledWhen Erase Background is enabled Index DIP Switch 10, 27Red Lamp Unit Appendices